/Engine/Source/Developer/CollectionManager/Public/ICollectionManager.h
Re-parents a collection. The parent collection may be re-saved if it's too old to have a stable GUID.
true if the re-parent was successful. If false, GetLastError will return a human readable string description of the error.
bool ReparentCollection ( [FName](API\Runtime\Core\UObject\FName) CollectionName, [ECollectionShareType::Type](API\Developer\CollectionManager\ECollectionShareType\Type) ShareType, [FName](API\Runtime\Core\UObject\FName) ParentCollectionName, [ECollectionShareType::Type](API\Developer\CollectionManager\ECollectionShareType\Type) ParentShareType )